That definitely looks like a Springfield Sporter.
There were few made and Springfield quit building them when Winchester and Remington got enough bolt action rifles on the market to cover the demand.
Dollar value is considerable. I don't know how high, they seldom come up for sale.

The front sight is a commercial bead replacement... put in backwards and with the bead itself knocked off.

The barrel band is on backwards, the U mark stands for "up" and should be on the bolt handle side. But I would not mess with it at this late date, it has apparently been on that way for a long time. You might just scrape up the finish trying to turn it around.

It is not a service rifle but it is a legitimate product of Springfield Armory.
The match director was being a real nitpicker to not let you shoot it alongside the service rifles.